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Sea are bodies of water on Earth's surface an average of the same physical and chemical properties, which are related to each other. It is also a vital community. It must be divided into three oceans: the Pacific, Atlantic and Indian Ocean. It must be Mediterranean (between continents), edge (along the edges of continents), internal (in the continent) and closed (independent, unrelated entities). Most of the sea are located along the edge must continents.

Some of the plants and animals represented in the sea algae, sea lettuce, fish, sea urchins and starfish.